body {
    margin: 0;
    padding: 0;
    .container {
        height: 400px;
        width: 600px;
        background: #999;
        margin: auto;
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        overflow: hidden;
        .contain {
            width:500%;
            height: 100%;
            position: relative;
            left: 0;
            // .active {
            //     // display: block;
            // }
            img{
                height:100%;
                width: 20%;
                // display: none;
                float: left;
            }
        }
        .dot-container {
            position: absolute;
            bottom:10px;
            right: 10px;
            max-height: 30px;
            .dot {
                height: 16px;
                width: 16px;
                border-radius: 50%;
                background: #999;
                margin-right: 10px;
                float: left;
                text-align: center;
                color: white;
                cursor: pointer;
            }
        }
        .up, .down {
            width: 40px;
            height: 40px;
            background: rgba(0, 0, 0, 0.3);
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            text-align: center;
            line-height: 40px;
            color: white;
            cursor:pointer;
        }
        .up:hover, .down:hover {
            background: rgba(0, 0, 0, 1);
        }
        .down {
            right: 0;
        }
    }
}